Price Variations in a Stock Market With Many AgentsLarge variations in stock prices happen with sufficient frequency to raise doubts about existing models, which all fail to account for non-Gaussian statistics. We construct simple models of a stock…P. Bak, M. Paczuski, M. Shubik·Sep 16, 1996SaveLearn
Electronic Raman scattering in YBCO and other superconducting cupratesSuperconductivity induced structures in the electronic Raman spectra of high-Tc superconductors are computed using the results of ab initio LDA-LMTO three-dimensional band structure calculations via…Thomas Strohm, Manuel Cardona·Sep 16, 1996SaveLearn
Self-consistency and Symmetry in d-dimensionsBethe approximation is shown to violate Bravais lattices translational invariance. A new scheme is then presented which goes over the one-site Weiss model yet preserving initial lattice symmetry. A…Serge Galam·Sep 16, 1996SaveLearn
Near-Surface Long-Range Order at the Ordinary Transition: Scaling Analysis and Monte Carlo ResultsMotivated by recent experimental activities on surface critical phenomena, we present a detailed theoretical study of the near-surface behavior of the local order parameter m(z) in Ising-like spin…P. Czerner, U. Ritschel·Sep 16, 1996SaveLearn
Quantum Fluctuations and Resistivity of Thin Superconducting WiresWe present a microscopic study of the quantum fluctuations of the superconducting order parameter in thin homogeneous superconducting wires at all temperatures below TC. The rate of quantum phase…Andrei D. Zaikin, Dmitrii S. Golubev, Anne van Otterlo et al.·Sep 16, 1996SaveLearn
Critical Behavior of the Supersolid transition in Bose-Hubbard ModelsWe study the phase transitions of interacting bosons at zero temperature between superfluid (SF) and supersolid (SS) states. The latter are characterized by simultaneous off-diagonal long-range order…Erwin Frey, Leon Balents·Sep 16, 1996SaveLearn
A Theory of the Longitudinal and Hall Conductivities of the Cuprate SuperconductorsWe establish the applicability to transport phenomena in the cuprate superconductors of a nearly antiferromagnetic Fermi liquid (NAFL) description of the magnetic interaction between planar…Branko P. Stojkovic, David Pines·Sep 16, 1996SaveLearn
Weak-coupling calculation of the gap structure of doped n-leg Hubbard laddersIn weak coupling, the spin gap in doped, even, n-leg periodic Hubbard ladders reflects the energy to break a pair into separate quasiparticles. Here we investigate the structure of the gap within a…N. Bulut, D. J. Scalapino·Sep 16, 1996SaveLearn
Double butterfly spectrum for two interacting particles in the Harper modelWe study the effect of interparticle interaction U on the spectrum of the Harper model and show that it leads to a pure-point component arising from the multifractal spectrum of non interacting…Armelle Barelli, Jean Bellissard, Philippe Jacquod et al.·Sep 15, 1996SaveLearn
Two interacting particles in the Harper modelDynamics of two particles with short range repulsive or attractive interaction is studied numerically in the Harper model. It is shown that interaction leads to appearance of localized states and…D. L. Shepelyansky·Sep 15, 1996SaveLearn
Series expansion studies of random sequential adsorption with diffusional relaxationWe obtain long series (28 terms or more) for the coverage (occupation fraction) θ, in powers of time t for two models of random sequential adsorption with diffusional relaxation using an…Chee Kwan Gan, Jian-Sheng Wang·Sep 15, 1996SaveLearn
Quasiparticle Lifetime in a Finite System: A Non--Perturbative ApproachThe problem of electron--electron lifetime in a quantum dot is studied beyond perturbation theory by mapping it onto the problem of localization in the Fock space. We identify two regimes, localized…B. L. Altshuler, Y. Gefen, A. Kamenev et al.·Sep 15, 1996SaveLearn
dx2-y2 Symmetry and the Pairing MechanismAn important question is if the gap in the high temperature cuprates has dx2-y2 symmetry, what does that tell us about the underlying interaction responsible for pairing. Here we explore this by…N. Bulut, D. J. Scalapino·Sep 15, 1996SaveLearn
Supercurrent Decay by Vortex Nucleation in the Presence of an Array of Pinning Centres: A Renormalization Group ApproachWe study the phenomenon of decay of a supercurrent in a superconducting thin film due to the spontaneous homogeneous nucleation of quantized vortex-antivortex pairs in the absence of an external…Roberto Iengo, Giancarlo Jug·Sep 14, 1996SaveLearn
Dissipative dynamics of vortex lines in superfluid 4HeWe propose a Hamiltonian model that describes the interaction between a vortex line in superfluid 4He and the gas of elementary excitations. An equation of irreversible motion for the density…H. M. Cataldo, M. A. Despósito, E. S. Hernández et al.·Sep 14, 1996SaveLearn
Determining the structure of the superconducting gap in Cu2O3 2-leg ladder materialsSuperconductivity has been recently observed in Sr0.4Ca13.6Cu24O41.84 which contains quasi-one-dimensional Cu2O3 2-leg ladders. If, as suggested by some theories, the…N. Bulut, D. J. Scalapino·Sep 14, 1996SaveLearn
Vortex Velocities in the O(n) Symmetric TDGL ModelAn explicit expression for the vortex velocity field as a function of the order parameter field is derived for the case of point defects in the O(n) symmetric time-dependent Ginzburg-Landau model.…Gene F. Mazenko·Sep 13, 1996SaveLearn
Self Consistent Screening Approximation For Critical DynamicsWe generalise Bray's self-consistent screening approximation to describe the critical dynamics of the ϕ4 theory. In order to obtain the dynamical exponent z, we have to make an ansatz for…Matteo Campellone, Jean-Philippe Bouchaud·Sep 13, 1996SaveLearn
Symmetry of the superconducting gap in HgBa2CaCu2O6+δ single crystals from electronic Raman scatteringPure electronic Raman spectra with no phonon structures superimposed to the electronic continuum, are reported for the first time, in optimally doped HgBa2CaCu2O6+δ single crystals $(Tc…A. Sacuto, N. Bontemps, P. Monod et al.·Sep 13, 1996SaveLearn
Semiflexible Chains under TensionA functional integral formalism is used to derive the extension of a stiff chain subject to an external force. The force versus extension curves are calculated using a meanfield approach in which the…B. -Y. Ha, D. Thirumalai·Sep 13, 1996SaveLearn
Spin splitting in a polarized quasi-two-dimensional exciton gasWe have observed a large spin splitting between "spin" +1 and -1 heavy-hole excitons, having unbalanced populations, in undoped GaAs/AlAs quantum wells in the absence of any external…L. Vina, L. Munoz, E. Perez et al.·Sep 13, 1996SaveLearn
Infrared response of ordered polarons in layered perovskitesWe report on the infrared absorption spectra of three oxides where charged superlattices have been recently observed in diffraction experiments. In La1.67Sr0.33NiO4, polaron localization…P. Calvani, A. Paolone, P. Dore et al.·Sep 13, 1996SaveLearn
Magnetization Profile in the d=2 Semi-Infinite Ising Model and Crossover between Ordinary and Normal TransitionWe theoretically investigate the spatial dependence of the order parameter of the two-dimensional semi-infinite Ising model with a free surface at or above the bulk critical temperature. Special…P. Czerner, U. Ritschel·Sep 13, 1996SaveLearn
Microscopic Non-Universality versus Macroscopic Universality in Algorithms for Critical DynamicsWe study relaxation processes in spin systems near criticality after a quench from a high-temperature initial state. Special attention is paid to the stage where universal behavior, with increasing…U. Ritschel, P. Czerner·Sep 13, 1996SaveLearn
Parquet solution for a flat Fermi surfaceWe study instabilities occurring in the electron system whose Fermi surface has flat regions on its opposite sides. Such a Fermi surface resembles Fermi surfaces of some high-Tc superconductors.…Anatoley T. Zheleznyak, Victor M. Yakovenko, Igor E. Dzyaloshinskii·Sep 13, 1996SaveLearn